Kevin Federline has now spoken up about Britney Spears' conservatorship. The Pop Princess's ex-husband gives his full support to his former wife in her fight for freedom, but it looks like he has some concerns.

Federline's attorney Mark Vincent Kaplan reveals his client suggests that before Spears regains complete control of her life, she has to have an "expert evaluation." He told Page Six that his suggestions are based on the decision made on the pop singer's medical care.

"I know she had revealed in the statement she made that she had been put on lithium," Kaplan says. The divorce attorney believes it's a "very powerful psychotropic medication," so he hopes that a medical professional prescribes it for a condition deems appropriate to do so.

If the conservatorship ends without an exit evaluation, the DJ wants to know Spears' condition that puts her under that medication.

"Kevin would probably have to engender some dialogue along those lines at some point in time if that were to occur," the lawyer explains.

Federline believes the hitmaker's health and happiness play a significant role in co-parenting their sons, Sean Preston, 15, and Jayden James, 14. Just like others, he wants nothing but the best for the mother of his kids, People noted.

It's the best thing for Spears to be "healthy and happy." If either of these things isn't true, Kaplan reveals: "It doesn't provide for the best setting for custody to be exercised."

Despite their separation, Federline has nothing but utter respect for Spears. He wants the very best for her, knowing that if she finally achieves what she wants, it will be the best for their kids, too.

It can't be denied that Sean and Jayden love their mom so much and their dad wants them to have a "healthy and strong relationship." Talking about Spears' speech about her petition to end her conservatorship after 13 years to get her life back, Kaplan says it's the best way for her "voice to be heard."

If the 39-year-old star is now deemed strong and healthy, it only fits that she can gain control of her own life once again. However, that's if she can do it in a reasonable and responsible way.

Kaplan also suggests the court has to ensure that she's entirely okay - mental-health-wise. Anyhow, it looks like Spears still has to file a formal motion to end her conservatorship.